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Narrow-band oxygen sensors are electrochemical devices based on a zirconia (ZrO₂) solid electrolyte. They generate a characteristic binary voltage signal in response to exhaust oxygen concentration: • Rich mixture (low O₂): 0.8–1.0V • Lean mixture (high O₂): 0.1–0.3V While conventional designs rely on an external reference air channel to establish an oxygen baseline, modern variants employ a pumped O₂ reference architecture. In this approach, a precisely controlled ion current (typically ~20μA) is used to create an internal oxygen reference, eliminating the need for a physical air channel. This sealed design greatly enhances resistance to contamination from oil, fuel additives, or water ingress. Regardless of reference method, all Narrow-band type sensors deliver the same fundamental function: providing the ECU with a stoichiometric switching signal (around λ=1) for closed-loop fuel control and catalyst monitoring. Their proven reliability, fast response, and cost-effectiveness make them a cornerstone of gasoline engine emission systems worldwide.